Genuine Dell HK980 CT103 UW457 For Dell Dimension E521 Desktop (DT) System AMD Athlon Nvidia GeForce 6150LE DDR2 SDRAM Motherboard Mainboard Logic Board Compatible Dell Part Numbers: YY838, DR830, HK980, CT103, UW457 Chipset: Nvidia GeForce 6150LE, Supported Processors: AMD Athlon 64 X2 dual-core processor, AMD Athlon 64 processor, AMD Sempron processor Supported Memory: 533-MHz, 667-MHz, 800-MHz (when available) DDR2 SDRAM, Four memory connectors, Capacity: 256 MB, 512 MB, or 1 GB non-ECC, Max Capacity: 4GB, Audio: Sigmatel 9227 CODEC (7.1 Channel audio) Peripheral Interfaces: Video: 15-hole connector, Network Adapter: RJ-45 Connector, USB: Two front-panel and four back-panel USB 2.0-Compliant connectors, Audio: Six (6) Connectors for 7.1 support Expansion Capabilities: PCI Connectors: 2, PCI Connector Size: 124 pins, PCI Connector Data Width (Maximum): 32bits, PCI Express Connectors: one x1, PCI Express Connector Size: 36 pins, PCI Express Connector Data Width (Maximum): 1 PCI Express Lane, PCI Express Connector: one x16, PCI Express Connector Size: 164 pins, PCI Express Connector Data Width (Maximum): 16 PCI Express Lanes Compatible Part Numbers: YY838, DR830, CT103, UW457